基于有源功率解耦的小电容PFC变换器

Small Capacitance PFC Converter Based on Active Power Decoupling

摘要: 针对传统大容量电解电容PFC电路可靠性低、寿命短的缺点，论文研究了一种基于功率解耦的高可靠PFC变换器。它采用具备小容量薄膜电容的有源功率解耦电路替代传统PFC变换器的大容量的电解电容，通过控制有源功率解耦电路实现电容电压互补，从而有效避免电网二倍频脉动功率导致的母线电压脉动，同时提高PFC变换器的可靠性和使用寿命。论文详细分析了有源功率解耦电路工作原理，推导其数学模型，提供了电路参数的设计思路。最后，通过MATLAB软件仿真比较和验证该电路的可靠性。

Abstract: Aiming at the disadvantages of low reliability and short life of traditional large capacity electrolytic capacitor PFC circuit, a high reliability PFC converter based on power decoupling is studied in this paper. It uses an active power decoupling circuit with a small-capacity thin-film capacitor to replace the large-capacity electrolytic capacitor of the traditional PFC converter. By controlling the active power decoupling circuit, the capacitor and voltage complement each other, so as to effectively avoid the voltage pulsation of the bus caused by the power grid double frequency pulsation, and improve the reliability and service life of the PFC converter. This paper analyzes the working principle of active power decoupling circuit in detail, deduces its mathematical model, and provides the circuit parameter design idea. Finally, the reliability of the circuit is compared and verified by MATLAB simulation.